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baxi 105he hw works fine but no ch?

baxi 105he the hot water works but the central heating doesnt
rod, September 2008
does the boiler recognise ch demand, ie radiator light coming on? does the boiler fire? does it ignite and go out?

if it does not even recognise demand what timer do you have, mechanical ones are very un-reliable so you could try isolating power and linking mechanical timer out if thats whats fitted (3&4)

iain, September 2008
link Click here to see other fixes for Baxi 105HE.